Telegraph system



March 10, 193R. 5 AD 1,795,652

"TELEGRAPH SYSTEM Fn d 'Odt. 4, 1929 I ATTORNEY Patented Mar. 10, 1931 "uNirEo STATES PATENT OFFICE FULLERTON S. KINKEAD, OF BROOKLYN, NEW YORK, ASSIGITOB TO. BELL TELEPHONE LABORATORIES, INCORPORATED, OF NEW YORK, N. Y., A. CORPORATION OF NEW YORK TELEGRAPH SYSTEE Application filed October 4, 1929. Serial No. 397,177.

This invention relates to the art of telegraph communication and particularly to.

selective calling and control arrangements for printing telegraph systems.

The objects of the invention are to facilitate the selection and control of telegraph stations, to simplify the apparatus employed, and to otherwise improve systems of this char. acter.

A feature of this invention is a system comprising aplurality of printingtelegraph sta tions each equipped with code selecting switches and impulse sending devices and so arranged that the operator at any station may selectively call any other station by sending the proper code consisting of successive series of impulses, each series causing a temporary setting of the switches and the recording of the series at the called station only, whereupon the 'switches release in order to receive and record the next series of impulses of the code.

I Another feature is a system in which the selective switches are set by impulses of one character to select a desired station and by impulses of another character for releasing partially selected stations to enable their subsequent selection. r

A further feature is a system in which the sending of impulses of one character causes the operation of the selective switch to select the called station and render its printing equipment effective, whereas impulses of a different character'operate the switch'to cause the release of a station so selected.

, The invention has been illustrated in the Y accompanying drawing in which two stations i A dial, control keys and signal lamp have been shown in a dotted enclosure marlmd fi whene as the remaining equipment at this station for selecting it has been shown in detail. The switch responsive to impulses received over the line L has been shown with two rows of contacts and corresponding wipers at 8 and 10, respectively. This switch may be any well' known step-by-step type having an operating magnet 11 and a release magnet 12. At station Ball the equipment has been shown in diagrammatic form, the printer at 5, the dial at 6 and the remaining apparatus indicated by the enclosure 7.

A description of the operation of this system under various conditions will now be described. To call one station from another the number, which is a two digit number,

should be dialed on a dial, such as 13,-and

that the relays 1 6 and 17 are normally oper- 'ated over a circuit from battery through the windings of relay 17 and the winding of relay 16 in parallel through the normal connection closed by the armature 19 of polarized relay 15 to ground. These relays remain operated during the sending of-the dial pulses as they are slow-to-release. The first operation of the armature 19 closes a circuit for the stepping I magnet 11 as follows: battery, winding of magnet 11, left make-before-breakcontacts of relay 20, armature 19 to ground. Relay 21 is also. operated at this time from battery through the right hand winding of this relay,

left hand make-before-break contacts of relay 20, armature 19 to ground; Rotary mag- 1165 lei-@119 themoyement Qf armature 19 and back contact of relay 24 and outer left hand armature and back contact of relay 2 5.

' When the eight impulses have been sent relay 21 releases and as relay 23' is slow-to-release ground will momentarily be rqyided through the ofl normal contacts outer right hand armature and back contact of m lay 21, right hand armature and front contact of relay 23, right. hand make-before-br'eak contacts of relay 20, wiper and eighth contact .of switch bank 8, winding of relay 26, left hand. armature and back contact of relay 27, outer right hand armature andback contact of relay 28 tobattery. Relay 26 is there by operated and provides a locking circuit for itself frombattery and the armatures of re lays 27 and 28' through its winding and left hand armature and front contact to ground.

' When relay 23.releases a circuit is provided forthe release magnet 12 from battery, wind-' ing of this magnet, right hand armature and back contact of relay 23, outer right hand armature and back contact-of relay 21, olfnormal contacts 22 to ground. Switch 0 is thereby released and on the return to normal mag.- net 12 is released through the opening of the off normal contacts 22 in the circuit therefor.

The second digit from station Bmay now be sent and this causes the same operations at station A as hereinbefore described except that in this case the wipers of switch 0 will be advanced to the fifth terminal and the momentary circuit closed therethrough in bank 8 causes the operation of relay 30 as follows: battery, inner left hand armature andback contact of relay 25, winding of relay 30, righthandarmature and front contact of relay 26, fifth terminal of bank 8 and the associated wiper, right hand make-before-break contacts ofrelay 20, right hand armature and front contact of relay-23, outer right hand armature and back contact of relay 21, off normal'contacts 22 to ground. Relay 30 provided a locking circuit for itself from batter connected through its winding and inner 1e t hand armature and, front contact, through contacts of key 40, to ground. The. busy signal-3l associated with dial 13 is now lighted dimly, over a circuit frombattery through the lamp, outerright hand armature and front contact of'relay 30, resistance 32 to ground,

to indicate the busy condition of'this station. l

' The next operation of a dial at station" B,

tenth terminal. A. momentary circuit is then closed for the operation of relays 20 and 28 from battery through the outer left hand armature andback contact of relay 25, left hand armature and back contact of rela 24, windings ofrelay 28 and 20 in paralle, tenth terminal of bank 8 andtits wiper, to ground as hereinbefore described. Belay 20 provides a locking circuit for itself through its inner left hand armature and front contact and .it-algo. provides a locking circuit for relay 28 through this armature and front contact independent of the original circuit through the wiper of bank 8. Relay 20 provides another connection for lamp 31 in parallel with the outer right hand armature and front contact of relay 30. The circuit for rotary magnet 11. is also transferred by relay 20 from control by armature 19 to con-' trol by the, armature of relay 17 through the outer left hand armature and front contact of relay 20. The connection from ground controlled by, relay 23 for the wiper of bank controlled through contacts of relays 34 and I 30. Finally relay 28 also closes the circuit for printer control relay 33, to start the rinter. This circuit may be traced from attery through the inner right handarmature and front contact of relay 28, Wlfldlll" of: relay 33, inner right hand armature V and front contact of relay 30, to ground. The control'relay 33-closes a circuit for the motor in this" printer from a source 35. The message from station-B to station A may now be sent with relays 30, 20, 28 and 33 in, operated condition, busy lamp 31 lighted'dimly and the alarm signal 50 operating. If it is desired to stopthealarm signal the key 36 may be operated thereby closing a circuit for the operation of relay 34 which opens the alarm signal circuit. Relay 3.4 provides a locking circuit for itself from battery through the inner right hand armature and front contact of relay 28, winding 'ofrelay station where the first digit is the same as for station A, relays corresponding to .relay 26 will be operated and locked in operated position until the digit 0 is dialed when they are released. Onthe other hand, relays corresponding to relays 20 and 28 will be operated andmaintained operated although it should be noted that the audible signal circuits will not be closed, nor will the contr'ol relays be operated at these stations due to the fact that the relays corresponding to relay 30 are not operated.

If it is desired, after station A has been selected, to select other stations without releasing the equipment at station A, three socalled' break signals will be transmitted from station B. These signals will be longer than impulses while dialing an ordinary number. Hence, if reference is made to operations at station A, relays 16 and 17 will be alter-L nately released and operated three times through the operation of the armature 19. It should be noted now that the stepping magnet-1 1' 'is under the control of relay 17 so thattheswitches at the various stations will be advanced to the third terminal and when thewiper of bank lO receives the momentary ground before relay 23 releasesa circuit is completed for the operation of relay 24 as follows. From battery, winding of this relay, third terminal of bank 10 and the associated wiper, outer righthand armature and front contact of relay 20, right hand armature and front contact of relay 23 to ground as hereinbefore described. Relay 24 causes relays 20 and 28 to release as the locking circuit for these relays is controlled through the left hand armature and-back contact of relay 24. The operation at all other stations will be identical'so that when the new number is dialed, actions will take place as hereinbefore described to call the desired station. It should be noted that relay 30 at station A will remain operated to maintain this station in called" condition for the reoperation of the printer control relay to restart the printer and to close the audible signal 50. It should be observed that the printer was stopped and the circuit for the signal 50 was opened at station A when relay 28 was released due to the break signals.

Another station may now be dialed, and if no other stations are desired on the line the numeral 0 is dialed to operate the signal '50 and start the printer at the called stations.

The operation at this called station and at the first called station will be the same as hereinbefore described. 7

If, however, a number. 0f additional stations are desired on the line, the number 0 is not dialed but the numbers of the difierent stations are dialedfin succession with the number 1 dialed'between the numbers and after the last number is dialed the number 0 is dialed for the purposes as hereinbefore described, namely, to start the printers and operate the signals 50;

Referring to actions at station A, when the number 1 is dialed the momentary ground is provided through the-wiper of bank 8 for the momentary operation of relay 27 over a circuit as follows. From battery, outer right hand armature and back contact of relay 28, winding of relay 27, first terminal of bank 8 and its wiper, right hand make-before-break contacts of relay 20, to ground as hereinbefore described. Relay 27in operating opens the operating circuit from relay 26 and while this has he cited: at stationA it should be observed that whenthe-relays corresponding to.

relay 27 operateat such stations where the relays corresponding to relay 26 may be operated, these latter relays will release. Such relays would be operated only at stations having the same first digit as the station just calleda If the operator at station B should have decided originally to call more than one station the number Owould not have been dialed after having dialed the first station but in-- stead this operator would have dialed the number 1 between each succeeding number and the number 0 after the last station.

To release the calling station and the called stations after the message is sent, a signal comprising five break signals will be transmitted from the calling station. This will bring the wipers of switch C and all the other switches-to the fifth-terminal. In this case, and referring to the actions at station A, a

circuit will be closed for the operation of relay 25 from battery, winding of relay 25,

sponding wiper to' the temporary ground as the fifth terminal of bank 10 and the correhereinbefore described. Relay 25 provides'a locking circuit for itself-through its right hand armature and front contact to ground controlled by relay 20. This relay 25 releases relay 30 and opens the locking circuit for relays 20 and 28 so that all three relays 20, 28 and 25 will be released. The operations at the othercalled stations will be the same,

that is, the relays corresponding to relays 20, 28 and 25 and 30 will release and thus restore the circuits at these stations to normal. At all stations but the calling and called stations, relays correspondin Ito relays 20, 28 and 30 will be released so t at the circuits at'all of these stations will also be returned to normal.

If all stations on the line are to be called the numberQO will be transmitted from statipn B. I'n'this case when 9 is dialed-a. circuit will'beclosedforrelay 30 and alt-relays 1- corresponding to relay andwhen 'fi is dialed relays 28 and20 aad'all' relays correspondin thereto at other stations .will be operate so as to light the busy si nals and start like printers and operate t e alarm $1 a ndesigning the code for these signals any number from 2 to 8. may be used for the first digit of the codes and an number from 2 to 8 inclusive may be used: or the second digit of the codes except the.one which has been us d for the first dpit. 'In this manner 42 odes may be used or an equal number of stations in. the system as presumably arranged. The printer control relay may be released at any station to stop the printer new by operating key 40 at station A or the corresponding key at other stations toopen the. circuit. fo relay .30 or correspondin relays. The printers may again be start by the peration of key 41; at station A or wrrespondingkeys at, other stations.

It Should be understood: thatwhile' the inqllhicnhaaheen disclosed in connection with but c osings-printing telegraph system it may readily be applied to other systems without d artmgfrom the sp'rit thereof.

at is claimed 1s:

1. 'In aslgnaling system, a line, ofstations associated therewith, switch at eachstation, s gnals from one station g hfi at the other stations a plural ty of times, and means for recording said settings atone of said stations only.

2- In a signaling system, a line, a plurality of stat1ons associated therewith, a; selector switch at each station, means rcs onsive to s gnals from one Station for sim taneously setting and thereafter releasing the switches at the other stations a plurality of times, and means for recording said sired number of stations. only.

3. In a signalingysystem, a line, of stations associated therewith, each station, each station, impulses for a plurality means responsive to a plurality a switch at actuating said switches to efi'ect the. selection of one station and the release of,

all switches, and means responsive to anotherv kind ofimpulses for actuating said switches to effect the release of the sclected.

station and the release of all switches.

at, In a signaling system, a line, a plurality of stations associated therewith,-a switch at each station, impulse transmitting means at each station, means responsive to onekind of impulses for actuating said switches for conditioning one station only for. reception of impulses of another kind and for effecting the release of said switches and removal of said switches from control by impulses of said other kind, and means responsive to a third kind of impulses for actuating said switches to effect the restoration of the. conditioned station to normal and release of said switches.

a selector fm' temporarily setsettings at any deimpulse transmitting means at means responsiye-to one kind of' ries-of impulses, and means selectively operated by the switch at one station for rendering the printing telegraph set thereat subject to control by impulses of the other kind, and means operated by the switch at each station individually for rendering it unresponsive, to said other kind of impulse.

6. In a signaling system, a line, a plurality of stations each equipped with a printing teleg a h set, a switch at each station, means at eac r station for transmitting series of impulses, means responsive to each series of impulses from one station for setting the switches atthe other stations, means for antomatically releasing said switches after each setting, and means electively operated by the switches of a plurality of stations for rendering effective the printing telegraph i h 1 It i t nasi a 'ng stem,apura i yo sations each ezuippell with a printing telegraph set, a switch at each station, means at each station for transmitting series of impulses, means responsive to each series of1mpulses from one station for setting the switches at the other stations, means for automatically releasing said switches after each setting, means' selectively operated by the switches of a plurality of stations for successively renderin said switches responsive to other series 0 impulses, and means responsive to said other series of impulses for actuating the switches at said plurality of stations .for simultaneously rendering the printing telegraph sets thereat efi'ective.

8. In a telegraph system, a signal trans mission circuit, a plurality of stations associated therewith, each station equipped with a printing telegraph set, at each station, means at each station for transmittingseries of impulses, means responsive to each series of im ulses transmitted from any station for setting the switches a. selective switch the switches at all other stations, means for automatically releasing said switches after each operation, other means at each of said stations for transmitting impulses of auditferent character, and means at a called station responsive to impulsestransmitted by said last impulse sending means for ope'ra'ting the switch to cause release of the equip ment at the called station.

In Witness. whereof, I hereunto subscribe my name this 1st day of October, 1929.

FULLERTON S. KINKEAD.

i so 

